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Cell : The Unit of Life

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
 Give the functions of cell wall.

The cell wall performs the following functions.

1. It maintains shape of the cells and provides structural support to the cell.

2. It protects the cells from mechanical injury.

3. It wards off the attacks of pathogens (viruses, bacteria, fungi, protozoans) and protects from infection.

4. It allows the transport of materials in and out of the cell.

5. The cell wall helps in cell to cell interactions. 

 


Who concluded, “Cells are the ultimate units forming the structure of all plant tissues”?

Mathias Schleiden.

What is the function of contractile vacuole in amoeba?

Excretion.

 What are receptor molecules ?

Receptor molecules are specific proteins in the cell's plasma membrane that receive chemical signals from outside the cell. When such chemical signals bind to a receptor, they cause some form of cellular response. 

State one difference between gram positive and gram negative bacteria.

Gram positive bacteria retains the gram stain whereas the Gram negative bacteria does not. 

Who reported that the cell had an outer layer which is known as plasma membrane today?

Theodore Schwann